diff --git a/configure.ac b/configure.ac
index 0afe270df..4a29b2195 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1188,6 +1188,7 @@ AC_CHECK_FUNCS([          \
 	mlock                 \
 	mlock2                \
 	mmap                  \
+	msync                 \
 	posix_fadvise         \
 	posix_madvise         \
 	preadv2               \
diff --git a/include/ircd/allocator.h b/include/ircd/allocator.h
index ccc19abbf..0b0e20568 100644
--- a/include/ircd/allocator.h
+++ b/include/ircd/allocator.h
@@ -50,6 +50,8 @@ namespace ircd::allocator
 	size_t advise(const const_buffer &, const int &);
 	size_t prefetch(const const_buffer &);
 	size_t evict(const const_buffer &);
+	size_t flush(const const_buffer &, const bool invd = false);
+	size_t sync(const const_buffer &, const bool invd = false);
 
 	void protect(const const_buffer &, const bool = true);
 	void readonly(const mutable_buffer &, const bool = true);
diff --git a/ircd/allocator.cc b/ircd/allocator.cc
index 8ec22ef3d..16f8983b0 100644
--- a/ircd/allocator.cc
+++ b/ircd/allocator.cc
@@ -165,6 +165,46 @@ ircd::allocator::protect(const const_buffer &buf,
 	sys::call(::mprotect, ptr, size(buf), prot);
 }
 
+size_t
+ircd::allocator::sync(const const_buffer &buf,
+                      const bool invd)
+{
+	assert(aligned(data(buf), info::page_size));
+	const prof::syscall_usage_warning message
+	{
+		"msync(2) MS_SYNC MS_INVALIDATE:%b", invd
+	};
+
+	#if defined(HAVE_MSYNC)
+		int flags {MS_SYNC};
+		flags |= invd? MS_INVALIDATE: 0;
+		sys::call(::msync, mutable_cast(data(buf)), size(buf), flags);
+		return size(buf);
+	#else
+		return 0;
+	#endif
+}
+
+size_t
+ircd::allocator::flush(const const_buffer &buf,
+                       const bool invd)
+{
+	assert(aligned(data(buf), info::page_size));
+	const prof::syscall_usage_warning message
+	{
+		"msync(2) MS_ASYNC MS_INVALIDATE:%b", invd
+	};
+
+	#if defined(HAVE_MSYNC)
+		int flags {MS_ASYNC};
+		flags |= invd? MS_INVALIDATE: 0;
+		sys::call(::msync, mutable_cast(data(buf)), size(buf), flags);
+		return size(buf);
+	#else
+		return 0;
+	#endif
+}
+
 size_t
 ircd::allocator::evict(const const_buffer &buf)
 {